Name in North American Boletes: Boletus appendiculatus
- Genus 2: Boletus
- Species 2: appendiculatus
Common Name: Butter Bolete
Tells: Short, butter-yellow, oft-bulbous stem may have red-brown stains, esp. lower down. Yellow pores darken w/age & stain blue. Firm texture.
Other Information: Cap color varies from pale yellow to a more typical reddish brown. Pale- to rich-yellow cap flesh may blue slowly & erratically. The common name refers to the butter-yellow stem, which may have subtle netting up high by the pores. Like all Butter Boletes, this mushroom has a very firm and appealing texture. Likes oak.
Science Notes: DNA testing moved this mushroom from Boletus to a newly erected genus called “Butyriboletus” (“butyri” being latin for “butter” and this being one of the Butter Boletes). The species name “appendiculatus” is now reserved for a lookalike European species.
- NH4OH (Ammonia): Cap flesh turns blue.
- KOH: Cap flesh turns pinkish.
- FeSO4 (Iron Salts): No data.